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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
set -e
kbuild_root=$(dirname $(readlink -f "$0"))
#OPTIONS='CONFIG_DEBUG_SECTION_MISMATCH=y'
#OPTIONS='C=1'
OPTIONS="KALLSYMS_EXTRA_PASS=0"
KCFLAGS="-Werror -Wno-error=cpp"
NFS_ROOT=$HOME/src/netboot
TFTP_ROOT=$HOME/tftpboot
#
# Options parsing
#
do_compile_doc=0
do_menu_config=0
do_package_deb=0
opt_bootloader=
opt_cmdline_file=
opt_defconfig=
while [[ $# != 0 ]] ; do
option=$1
shift
case $option in
--bootloader)
opt_bootloader=$1
if [[ ! -r $opt_bootloader ]] ; then
echo "Boot loader file $opt_bootloader is not readable"
exit 1
fi
shift
;;
--cmdline)
opt_cmdline_file=$1
if [[ ! -r $opt_cmdline_file ]] ; then
echo "Command line file $opt_cmdline_file is not readable"
exit 1
fi
shift
;;
--config)
do_menu_config=1
;;
--deb)
do_package_deb=1
;;
--defconfig)
opt_defconfig=$1
if [[ ! -r $opt_defconfig ]] ; then
echo "defconfig file $opt_defconfig is not readable"
exit 1
fi
shift
;;
--doc)
do_compile_doc=1
;;
--*)
echo "Unrecognized option $option"
exit 1
;;
*)
platform=$option
;;
esac
done
#
# Platform
#
if [[ -z "$platform" ]] ; then
for f in $kbuild_root/platforms/*.sh ; do
pattern=$(cat $f | grep "dir_pattern=" | head -1)
pattern=${pattern/#dir_pattern=/}
if [[ -n "$pattern" ]] ; then
echo $PWD | grep -q "$pattern" || continue
platform=$(basename -s .sh $f)
break
fi
done
fi
if [[ ! -r "$kbuild_root/platforms/$platform.sh" ]] ; then
echo "Unknown platform '$platform'. Supported platforms are"
for f in $kbuild_root/platforms/*.sh ; do
echo "- $(basename -s .sh $f)"
done
exit 1
fi
source "${kbuild_root}/platforms/$platform.sh" || exit 1
#
# Architecture
#
if [[ ! -r "$kbuild_root/arch/$arch.sh" ]] ; then
echo "Unknown architecture '$arch'. Supported architectures are"
for f in $kbuild_root/arch/*.sh ; do
echo "- $(basename -s .sh $f)"
done
exit 1
fi
source "${kbuild_root}/arch/$arch.sh" || exit 1
target_dir=${target_dir:-$NFS_ROOT/$arch_dir}
output_dir=${output_dir:-$PWD/output/$arch_dir}
#
# Parallelize make with twice as many jobs as CPUs
#
num_cpus=$(cat /proc/cpuinfo | grep '^processor\b' | wc -l)
pmake="make -j$((num_cpus*2))"
OPTIONS="KALLSYMS_EXTRA_PASS=0 KCFLAGS='$KCFLAGS'"
echo "Compiling for platform $platform with $num_cpus CPUs"
mkdir -p $output_dir/
if [[ -n "$opt_defconfig" ]] ; then
mkdir -p $output_dir/arch/$arch/configs/
cp $opt_defconfig $output_dir/arch/$arch/configs/build_defconfig
make ARCH=$arch O=$output_dir build_defconfig
rm $output_dir/arch/$arch/configs/build_defconfig
fi
if [[ $do_menu_config = 1 ]] ; then
make ARCH=$arch O=$output_dir menuconfig
exit 0
fi
#
# Compile documentation if requested
#
if [[ $do_compile_doc = 1 ]] ; then
$pmake ARCH=$arch O=$output_dir DOCBOOKS='' htmldocs
fi
#
# Compile the kernel, modules and DTBs
#
dtbs=
for dtb in $DTBS ; do
dtb=${dtb/:*/}
dtbs="$dtbs $dtb"
done
eval $pmake ARCH=$arch O=$output_dir CROSS_COMPILE=$cross_compile $OPTIONS \
$image_kernel $dtbs
grep 'CONFIG_MODULES=y' $output_dir/.config > /dev/null && modules=modules
if [[ x$modules == xmodules ]] ; then
eval $pmake ARCH=$arch O=$output_dir CROSS_COMPILE=$cross_compile $OPTIONS \
$modules
fi
version=$(cat $output_dir/include/generated/utsrelease.h | cut -d '"' -f 2)
#
# Create the image
#
make_fit_image() {
local kernel_its=$output_dir/arch/$arch/boot/kernel_fdt.its
cat <<EOF > $kernel_its
/dts-v1/;
/ {
description = "Kernel + FDT image for $board board";
#address-cells = <1>;
images {
kernel {
description = "Linux kernel";
data = /incbin/("$output_dir/arch/$arch/boot/$image_kernel");
type = "kernel";
arch = "$arch";
os = "linux";
compression = "none";
load = <$LOADADDR>;
entry = <$LOADADDR>;
hash-1 {
algo = "crc32";
};
hash-2 {
algo = "sha1";
};
};
EOF
local dtb
for dtb in $DTBS ; do
local src=${dtb/:*/}
local dst=${dtb/*:/}
dst=${dst/*\//}
cat <<EOF >> $kernel_its
fdt-$dst {
description = "Flattened Device Tree blob $dst";
data = /incbin/("$output_dir/arch/$arch/boot/dts/$src");
type = "flat_dt";
arch = "$arch";
compression = "none";
hash-1 {
algo = "crc32";
};
hash-2 {
algo = "sha1";
};
};
EOF
done
local config=$(echo $DTBS | sed 's/.*[:/]//')
cat <<EOF >> $kernel_its
};
configurations {
default = "conf-$config";
EOF
for dtb in $DTBS ; do
local dst=${dtb/*:/}
dst=${dst/*\//}
cat <<EOF >> $kernel_its
conf-$dst {
description = "Boot Linux kernel with $dst blob";
kernel = "kernel";
fdt = "fdt-$dst";
};
EOF
done
cat <<EOF >> $kernel_its
};
};
EOF
PATH="$output_dir/scripts/dtc:$PATH" mkimage -f $kernel_its ${kernel_its/its/itb}
}
make_srec_image() {
local image=$output_dir/arch/$arch/boot/$image_kernel
cat $image | lzma -z -e > $image.xz
objcopy -I binary -O srec --srec-forceS3 --srec-len 516 \
$image.xz $image.xz.srec
for dtb in $DTBS ; do
local src=${dtb/:*/}
objcopy -I binary -O srec --srec-forceS3 --srec-len 516 \
$src $src.srec
done
}
make_uboot_image() {
mkimage -A $arch -O linux -T kernel -C none -a $LOADADDR -e $LOADADDR \
-n "Linux-${version}" -d $output_dir/arch/$arch/boot/$kernel_image \
$output_dir/arch/$arch/boot/uImage
}
make_cros_image() {
local boot_dir=$output_dir/arch/$arch/boot
local vmlinuz=$boot_dir/$1
local bootloader
local config
if [[ -f $opt_bootloader ]] ; then
bootloader=$opt_bootloader
else
dd if=/dev/zero of=$boot_dir/bootloader bs=512 count=1
bootloader=$boot_dir/bootloader
fi
if [[ -f $opt_cmdline_file ]] ; then
config=$opt_cmdline_file
else
echo "$CMDLINE" > $boot_dir/cmdline
config=$boot_dir/cmdline
fi
vbutil_kernel \
--pack $boot_dir/vmlinuz.image \
--version 1 \
--vmlinuz $vmlinuz \
--arch $arch \
--keyblock /usr/share/vboot/devkeys/kernel.keyblock \
--signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk \
--config $config \
--bootloader $bootloader
}
case $IMAGE in
FIT)
make_fit_image
image_file=$output_dir/arch/$arch/boot/kernel_fdt.itb
;;
cros-arm)
make_fit_image
make_cros_image kernel_fdt.itb
image_file=$output_dir/arch/$arch/boot/vmlinuz.image
;;
cros-x86)
make_fit_image
make_cros_image bzImage
image_file=$output_dir/arch/$arch/boot/vmlinuz.image
;;
srec)
make_srec_image
image_file=$output_dir/arch/$arch/boot/$kernel_image.xz.srec
;;
uImage)
make_uboot_image
image_file=$output_dir/arch/$arch/boot/uImage
;;
*)
image_file=$output_dir/arch/$arch/boot/$IMAGE
;;
esac
#
# Copy the files to their destination directories
#
copy_dtbs() {
local dtb
local target_dir=$1
for dtb in $DTBS ; do
local src=${dtb/:*/}
local dst=${dtb/*:/}
dst=${dst/*\//}
cp $output_dir/arch/${ARCH}/boot/dts/$src* $target_dir/$dst
done
}
mkdir -p $BOOT_DIR
cp $image_file $BOOT_DIR/
if [[ $IMAGE != FIT && $IMAGE != cros-arm && $IMAGE != cros-x86 ]] ; then
copy_dtbs $BOOT_DIR/
fi
if [[ x$modules = xmodules ]] ; then
$pmake ARCH=$arch O=$output_dir CROSS_COMPILE=$cross_compile INSTALL_MOD_PATH=$target_dir modules_install
echo "Kernel modules installed to $target_dir/lib/modules/$version"
fi
if [[ $do_package_deb = 1 ]] ; then
$pmake ARCH=$arch O=$output_dir CROSS_COMPILE=$cross_compile bindeb-pkg
fi
echo "Kernel image available in $image_file"
echo "Build $version completed at $(date)"
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